The neutral bar will need to be isolated (it should have plastic insulator separating it from the case). @@@ OK, makes sense and I like space in a panel. For a detached garage sub panel does the panel need to be a main breaker or can it be a main lug? The garage does not need a separate ground rod or plate. Sub-panel in detached garage supplied from a service panel in a house by way of a four-wire feeder: two hots (black), neutral (white) and a ground (bare copper or green). This panel is in a detached building. A separate detached guest house w attached garage has a sub panel located in the garage that is fed from the main panel in the main house. Electrical Question: How Can I Install Electrical Wiring and a Sub Panel in a Garage? This may make it easier to understand… The PANEL does not require the disconnect, the BUILDING/STRUCTURE does. Researching here and what I was told by others was a main lug would be fine so I installed the box and ran all the wires. At a detached structure you can have a main breaker, main disconnect or you can use the 6 handle rule. If only a 3-wire is present, a separate isolated ground can be used at the sub panel location. In order to save $ on multiple GFCI breakers and/or receptacles I want to feed a sub panel to a shop/garage with a 50A GFCI breaker but am not sure if it will nuisance trip because of multiple circuits. The reasons are pretty simple: more power and more convenience. Please cite the specific article. It is a 100 amp sub-panel with 16 spaces. Main panel on exterior house wall has six breakers (including one, 100 amp, for the shop) and there is a sub panel inside of the home. Commonly available 60 amp panels are usually limited to 8 or more slots.100 amp 20 slot pannels are common and cheap.Now the feeder breaker can't be any larger than then SMALLEST of the ratings of the feeder wires or the sub-panel.So I would use a 60 amp breaker and feeders, but with the 100 amp sub-panel. The other way is allowed because it is cheeper. I will be wiring a detached garage this weekend and was looking for answers on the garage panel. Buy 100, wire to 60.The sub-panel does … I am installing a ~100-amp sub-panel in my "attached-detached" garage (an "attached-detached" garage is a detached garage that shares a continuous roof with the home). Lighting that is what a ground rod is for. A neutral and hot on 110 you bring in always 220 in a garage or shed what happens if you need it. 100FT away from the main panel. is to provide a path to the service panel and the transformer in case of a ground fault to the subpanel enclosure. That keeps your voltage balanced the receptacle box on a shed or a garage dont need a grond wire unless you go over head. (i.e. https://petersonelectricllc.com/ We wired up a garage that had a studio apartment above it. A very common size sub-panel feeder circuit to a detached garage is typically 100 amps which requires larger feeder conductors as well as a larger conduit size. If space is an issue, you don’t need to install it next to the main panel. The International Residential Code, the most widely adopted building code in the U.S., does not require that detached garages be provided with electricity. If you want to use your garage for a shop or plan to install air conditioning or other power-hungry appliances or tools, you'll have all the power you need. The sub-panel will be fed by my main 150-amp service panel. Thank you. 2 hot, neutral and ground. If the sub panel is in the same building then the sub panel doesn't need a main breaker but of course it need to be protected by a breaker just not at the panel. The electrician said that I would likely need a main cutoff breaker inside of the shop sub panel, not just in the house main panel. Seeking some advice on installing a sub panel in a detached garage. Sub panel has 8 breakers. Installing a Sub Panel for a Garage Electrical Question: I currently have power ran out to my garage, however it only runs 2 lights and the wiring is old. I am new to this forum and need some expert advice. Improve this question . The main house foundation is isolated from the mudroom/breezeway/garage foundation only by a foam insulation joint and cold pour joint, but the wood framing of all structures ARE connected. The safest installation is using a full size ground from the main building to the sub panel in the detached building. However, the code does set forth certain requirements for detached garages that are provided with electricity. Lots of others said including a sub-panel was the best move they made. grounding electrode with ground conductor) Separate ground not allowed in Canada 4 wires are required . I will be installing a sub panel in the garage rated at 60 amps 240v but cant seem to find in the CEC anywhere if there needs to be a main breaker in the garage panel. Rule #4: A terminal slot, no matter how large, can be assumed to be approved for one conductor only unless it is labeled otherwise. However, Rule #5 is an exception. You'll have 4 wires." I do think this also a requirement in some USA places . The branch circuits in the shop/garage are for an air compressor, lights, and receptacles (and a small beer refrigerator). The ground wire from the house must be connected to the sub-panel ground. Sub Panel in an Attached Garage Electrical Question: I want to add a panel to my attached garage, what size breaker do I need? I want to add a sub panel to my attached garage. Underground feed from house main panel via a 30 amp 2 pole breaker at 120/240 volts 4. Does the sub panel require a main disconnect? The area 3 feet (0.9 m) in front of and above and below the the panel should be clear from the floor to the ceiling. I just can't be sure whether a ground rod is required at this detached garage or not. I have a 200amp main in my house and I plan on installing a 90 amp sub-panel in a detached garage approx. Bonding to ground is He said, "no, you don't need to because you are replacing the overhead existing triplex with quadplex 4 wire. This line can be buried or overhead depending on personal preference and community rules. Share. Keep in mind that a closet is not an acceptable location for a panel. If the detached building has more than one circuit (in your case a panel that will feed more than one circuit) you will need a ground rod. I was talking to the elec inspector at the jobsite. He stated a detached garage. Can some one tell me the correct installation, the code reference and reason. Any advise would be appreciated. 5. The panel has a GEC to a UFER ground. asked Nov 12 '14 at 13:54. henry jackson henry jackson. Also, does the sub panel need a ground wire connected back to the main panel in the same building? Panels need 1 m clearance in front. I am saying that you never need a main breaker in a sub panel, detached or not. I understand that the NEC requires a separate ground rod for sub-panels in "detached structures," but I'm not clear if my application counts as attached, or detached. I would like to upgrade and put a breaker box in the garage so I can put in more lights, outlets and run a pool pump, etc. electrical subpanel. It has a 3-wire feed, and the neutrals and grounds are separated. I am receiving conflicting interpretations of the code from one inspector to another for grounding sub panels in a detached garage. Determine where you will mount the sub panel. I was planning on driving a ground rod when replacing overhead service to a detached garage. Thanks for your help. I have a detached garage in the backyard. Height of the panelboard – maximum height of the panelboard is 1.7 m from finished floor to the highest breaker position. Residential detached garage 2. But it wasn’t always this way. Can you feed a sub panel with a GFCI breaker? Sub panels require a 4-wire feed. The panel in the garage does not need a “main” breaker. And it's more convenient to have the circuit breakers in the garage. my question is do I need a disconnect (main breaker) in the sub-panel? 27.4k 12 12 gold badges 76 76 silver badges 142 142 bronze badges. The neutral bus is not bonded to the enclosure. Although a smaller sub-panel feeder breaker such as 40, 50, 60, 70 amps can also be used. A sub-panel with no grounding electrode and a grounding conductor that connects to the service panel grounding bus bar offers a parallel path (parallel with the neutral conductor) for any current getting onto the sub-panel enclosure, increasing the chances of strong current flow and electrical shock to anyone touching the sub-panel. If your garage is a separate, detached structure, then you need the isolated neutral, the bonded ground, and a driven ground rod bonded to the subpanel. My main electrical service panel is in the attached garage and is a 100 amp service. I ran a sub-panel to a garage that is 25 feet from the main residence. I was surprised and asked him about that. Does a sub panel need a main breaker if there is one at the main? If your home's electrical service panel (breaker box) is full and you need more room to add new circuits, installing a subpanel might be the way to go. Follow edited Nov 12 '14 at 14:54. gregmac. The panel looks very professional and tidy (except for the missing ground wire of course). That is, you need a grounding electrode conductor for your subpanel that is independent of the GEC for your main panel. The advantage of installing a breaker panel in the garage is that it allows you to have multiple circuits available while only needing to run one line to the garage from the house. However, you must be able run wire through to that area. Yes, all 125-volt, single phase, 15- or 20-amp receptacles in a garage must be GFCI-protected, with only one esoteric exclusion that we will cover later. No piping of any kind in the garage 3. 1. You should be able to buy a second bar for the sub-panel if it really is meant to be used as a sub-panel. The ground bar should be bonded to the case. I already missed having a grounding rod for the sub and don't want to miss anything else. 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